The properties of monocrystalline samples of the fluorite-structured solid solution, Na0.4Dy0.6F2.2, were studied at temperatures of between 380 and 730K by means of impedance spectroscopy. It was found that the temperature dependence of the anion conductivity obeyed an Arrhenius relationship. The conductivity at 500K was equal to 2.3 x 10-5S/cm, and the data could be described by:

σT (SK/cm) = 1.5 x 10-6 exp[-0.842(eV)/kT]

Ionic transfer in the crystals was explained in terms of the formation of cubo-octahedral clusters in the fluorite structure.

N.I.Sorokin, A.K.Ivanov-Shits, L.L.Vistin, B.P.Sobolev: Kristallografiya, 1992, 37[2], 421-6 (Soviet Physics - Crystallography, 1992, 37[2], 217-20)